Portable fan



FIG. 1 is a front left side perspective view of the portable fan;

FIG. 2 is a front elevational view of the portable fan of FIG. 1;

FIG. 3 is a rear elevational view of the portable fan of FIG. 1;

FIG. 4 is a left side elevational view of the portable fan of FIG. 1;

FIG. 5 is a right side elevational view of the portable fan of FIG. 1;

FIG. 6 is a top plan view of the portable fan of FIG. 1; and,

FIG. 7 is a bottom plan view of the portable fan of FIG. 1.

The broken line showing of environmental structure is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a portable fan, as shown and described. 